Laminated and partitioned automatic current control method applicable to multi-target power grid

Abstract

The invention relates to a laminated and partitioned automatic current control method applicable to a multi-target power grid, and belongs to the technical field of automation of power system dispatching. The method comprises multi-region control, multi-target control and laminated and partitioned coordinated control of section current; a laminated and partitioned power grid current coordinated control system and an adaptive control strategy; a sorting and allocating strategy which is used for adjusting the output of machine sets in real time, comprehensively takes voltage class, power grid region and energy-saving dispatching principle into account, and comprises a sorting and allocating strategy of generator unit clusters of different voltage classes in different power grid regions and a sorting and allocating strategy of generator units of same voltage class in the same power grid region; and partitioned independent super-short-term load forecasting control carried out in each control region of the power grid. The laminated and partitioned automatic current control method disclosed by the invention can be flexibly applicable to various power grid operating modes, and ensures that the power grid runs stably in an important power supply section circuit overhauling mode; and a hydro-power generating unit and a thermal power generating unit are controlled to generate power more consistently, and the method provides a powerful technical support for energy-saving power dispatching.

Description

technical field [0001] The invention relates to a multi-objective automatic control method for power grid hierarchical partition power flow, which belongs to the technical field of electric power system dispatching automation. Background technique [0002] Traditional automatic generation control is a safe and reliable grid operation guarantee technology for power system operation control. Its core purpose is to adjust the output of generator sets in real time according to the real-time operating status of the grid to realize automatic control of grid frequency and active power. [0003] In the traditional power grid real-time stability control system, its control goal is to control the accident in a certain emergency situation of the power grid, often by means of machine cutting and load shedding, and the control strategy and goal are often only suitable for a certain assumed accident mode of the local power grid , the control target is relatively single, the scope of adapt...

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Problems solved by technology

[0003] In the traditional power grid real-time stability control system, its control goal is to control the accident in a certain emergency situation of the power grid, often by means of machine cutting and load shedding, and the control strategy and goal are often only suitable for a certain assumed accident mode of the local power grid , the control target is relatively single, the scope of adaptation is narrow, and the flexibility is poor, which cannot meet the production needs of the entire network after the power grid is opened-loop, multi-section joint, early pre-control, and self-adaptive to changes in the operation mode of the power grid

[0004] Among the existing technologies, the dispatching and communication centers of some domestic grids and provinces have carried out research on "key technologies of automatic power generation control in interconnected power grids" and "theories and technologies of multi-region automatic power generation control (AGC)", focusing on meeting the requirements of tie-line power control. Research on automatic generation control of performance standards (hereinafter referred to as CPS), develop corresponding control software, establish multi-regional control model, realize AGC multi-regional automatic generation control, and be able to control the power of tie lines between power grids according to the CPS assessment standard Control: Through the combination of ultra-short-term load forecasting and real-time economic dispatching of the entire network, the AGC advance control of the entire network is realized, but the constraints of the stable section of the power grid are not considered, so it is impossible to effectively control the power flow of the stable section of the power grid

[0005] Some provincial-level dispatching and communication centers in China have carried out research on "AGC-based power flow control for stable sections", focusing on consideration of safety constraints, sensitivity analysis, and ultra-short-term load forecasting to achieve control of power flow at some stable sections in the power grid and form a closed-loop control , to solve the problem that the cross-section stable transmission power exceeds the limit, but it does not consider the comprehensive automatic sequencing control of power generation, so it cannot better meet the requirements of three-way dispatching and energy-saving dispatching of the power grid

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